Ethernet Protection System Providing Fault Tolerence for Communication Lines and Interface Cards According to Classified Failure States

1. An Ethernet protection system, comprising: a first Ethernet communication device operable to be connected to first and second Ethernet lines forming a parallel connection and select the first Ethernet line and transmit and receive data over the first Ethernet line, and upon detecting a failure in the first Ethernet line, automatically select the second Ethernet line and transmit and receive data over the second Ethernet line, wherein the first Ethernet communication device comprises: a first Ethernet card module operable to be connected to the first Ethernet line; a second Ethernet card module operable to be connected to the second ethernet line; and a switching device connected to the first and second Ethernet card modules and a communication line, the switching device operable to switch a connection to the communication line between the first and second Ethernet card modules, to detect a failure state from the first Ethernet card module and switch the connection to the communication line from the first Ethernet card module to the second Ethernet card module upon the detection of the failure state, wherein the failure sttates are classified according to first and second failure classes, and the switching device is operable to enter a revertive mode upon detecting a failure state in the first class, and enter a non-revertive mode upon detecting a failure state in the second class.

2. The system of claim 1 , wherein the switching device in the revertive mode is operable to detect a recovery state from the first Ethernet card module and switch the connection to the communication line from the second Ethernet card module back to the first Ethernet card module.

3. The system of claim 2 , further comprising a second Ethernet communication device operable to be connected to the first and second Ethernet lines and automatically configure to transmit and receive data over the Ethernet line selected by the first Ethernet communication device.

4. The system of claim 2 , wherein the first and second Ethernet card modules are first and second Ethernet mapper cards, respectively.

5. The system of claim 4 , wherein the Ethernet mapper cards are operable to transmit line quality data to the switching device, the line quality data indicating the failure state or the recovery state.

6. The system of claim 5 , wherein the switching device is a digital cross connect switch.

7. The system of claim 6 , wherein the first Ethernet communication device is a Multiple Services Carrier Node.

8. The system of claim 1 , wherein the switching device is further operable to receive user commands and switch the connection to the communication line between the first and second Ethernet card modules based on the user commands.

9. The system of claim 8 , wherein the user commands, failure states and recovery states are prioritized according to a priority scheme, and the switching device is operable to switch the connection to the communication line between the first and second Ethernet card modules based on the priority scheme.

10. The system of claim 1 , wherein the failure states of the first class include line failures, and failure states of the second class include card failures.

11. An Ethernet protection system for protecting an Ethernet connection defined by first and second Ethernet lines forming a parallel connection, comprising: a first Ethernet mapper card operable to be connected to the first Ethernet line; a second Ethernet mapper card operable to be connected to the second Ethernet line; and a switching device connected to the first and second Ethernet mapper cards and a communication line, the switching device operable to switch a connection to the communication line between the first and second Ethernet mapper cards, to detect a failure state from the first Ethernet mapper card and switch a connection to the communication line from the first Ethernet mapper card to the second Ethernet mapper card upon the detection of the failure state, and wherein the failure states are classified according to first and second failure classes, and the switching device is further operable to enter a revertive mode upon detecting a failure state in the first class, and enter a non-revertive mode upon detecting a failure state in the second class.

12. The system of claim 11 , wherein the switching device in the revertive mode is operable to detect a recovery state from the first Ethernet mapper card and switch the connection to the communication line from the second Ethernet mapper card back to the first Ethernet mapper card.

13. The system of claim 12 , wherein the Ethernet mapper cards are operable to transmit line quality data to the switching device, the line quality data indicating the failure state or the recovery state.

14. The system of claim 13 , wherein the switching device is a digital cross connect switch.

15. The system of claim 14 , wherein the switching device is further operable to receive user commands and switch the connection to the communication line between the first and second Ethernet mapper cards based on the user commands.

16. The system of claim 15 , wherein the user commands, failure states and recovery states are prioritized according to a priority scheme, and the switching device is operable to switch the connection to the communication line between the first and second Ethernet mapper cards based on the priority scheme.

17. The system of claim 16 , wherein failure states of the first class include Ethernet line failures, and failure states of the second class include Ethernet mapper card failures.